This is an age old question that has no simple answer. RPC is more resource intensive (CPU/Bandwidth/etc.), but can under certain circumstances be faster than WMI. The reverse can also be true under certain circumstances. WMI is light weight in comparison to RPC, but has limits on the number of simultaneous queries and connections that can be made to a single host. This can cause serialization to occur which can delay polling. This normally only manifests itself when polling a lot of information via WMI at high frequency. There really is no right or wrong answer. It really comes down to what works best in your environment. This is why we provide both as options within SAM for most every Windows component monitor type.
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